Smooth shadow boundaries with exponentially warped Gaussian filtering
dc.contributor.author
dc.date.accessioned
2015-12-04T12:35:14Z
dc.date.available
2015-12-04T12:35:14Z
dc.date.issued
2013
dc.identifier.issn
0097-8493
dc.identifier.uri
dc.description.abstract
Shadow mapping is widely used in computer graphics for efficiently rendering shadows in real-time applications. Shadow maps cannot be filtered as regular textures, thus their limited resolution can cause severe shadow map discretization artifacts in the rendered images. To solve this problem, several techniques have been proposed, including variance shadow maps (VSM) and exponential shadow maps (ESM). However, these techniques introduce different kinds of light leaking artifacts, which are clearly visible in moderately complex scenes. In this paper we propose a new statistical filtering method that approximates the cumulative distribution function (CDF) of depth values by a Gaussian CDF instead of bounding it with Chebyshev Inequality. This approximation significantly reduces light leaks and has similar performance and storage requirements compared to the original variance shadow map method. We also show that the combination of this technique with an exponential warp allows us to further reduce the remaining shadowing artifacts from the rendered image
dc.description.sponsorship
This work has been supported by the Spanish Ministry of Education and Science (TIN2010-21089-C03-01, TIN2010-21089-C03-03, TIN2009-14103-C03-01), Caja Castellem-Bancaja Foundation (P1.1B2010-08, P1.1B2009-34), the European Union (Ref. 226487), Generalitat Valenciana (Project PROMETEO/2010/028), BEST/2011/287, Generalitat of Catalunya (Catalan Government) (2009-SGR-643), and TAMOP - 4.2.2.B-10/1-2010-0009
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.relation
info:eu-repo/grantAgreement/MICINN//TIN2010-21089-C03-01/ES/CONTENIDO DIGITAL PARA JUEGOS SERIOS: CREACION, GESTION, RENDERIZADO E INTERACCION/
AGAUR/2009-2014/2009 SGR-643
dc.relation.isformatof
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.cag.2012.12.004
dc.relation.ispartof
© Computers and Graphics (Pergamon), 2013, vol. 37, núm. 3, p. 214-224
dc.relation.ispartofseries
Articles publicats (D-IMA)
dc.rights
Tots els drets reservats
dc.title
Smooth shadow boundaries with exponentially warped Gaussian filtering
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/embargoedAccess
dc.embargo.terms
Cap
dc.date.embargoEndDate
info:eu-repo/date/embargoEnd/2026-01-01
dc.type.version
info:eu-repo/semantics/publishedVersion
dc.identifier.doi
dc.contributor.funder
dc.relation.ProjectAcronym